Pelvic Organ Prolapse: Classification

Pelvic Organ Prolapse: Classification

Pelvic Organ Prolapse: Classification

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POP: Introduction - What's Dropping?

  • Pelvic Organ Prolapse (POP): Descent of one or more pelvic organs (bladder, uterus, bowel) into or beyond the vaginal canal.
  • Key Terminology by Compartment:
    • Anterior Wall: Cystocele (bladder), Urethrocele (urethra).
    • Apical Compartment: Uterine prolapse, Vaginal vault prolapse (post-hysterectomy).
    • Posterior Wall: Rectocele (rectum), Enterocele (small bowel).
  • Symptoms can include vaginal bulge, pelvic pressure, and urinary, bowel, or sexual dysfunction.

Pelvic organ prolapse ultrasound and diagram

⭐ The anterior vaginal wall, leading to cystocele, is the most frequently affected compartment in POP.

POP-Q System - Measuring the Sag

The Pelvic Organ Prolapse Quantification (POP-Q) system is a standardized, objective method to describe and stage POP. Measurements are in centimeters (cm) relative to the hymen (0cm).

  • Proximal to hymen: negative values (-cm)
  • Distal to hymen: positive values (+cm)
  • Measurements taken at maximal Valsalva.

POP-Q points and measurements

Nine Reference Points: (Hymen = 0cm)

  • Aa: Anterior wall, 3cm from hymen (normally -3cm).
  • Ba: Most distal anterior vaginal point.
  • C: Cervix / vaginal Cuff.
  • D: Posterior fornix (if cervix present).
  • Ap: Posterior wall, 3cm from hymen (normally -3cm).
  • Bp: Most distal posterior vaginal point.
  • GH: Genital Hiatus (urethra to posterior hymen midline).
  • PB: Perineal Body (posterior hymen midline to anal opening).
  • TVL: Total Vaginal Length (greatest depth of vagina when C or D is reduced). 📌 Remember the 6 key vaginal points (Aa, Ba, C, D, Ap, Bp) and 3 external/length points (GH, PB, TVL).

POP-Q grid and diagram for pelvic organ prolapse staging

POP-Q Staging (0-IV): Based on the most distal extent of prolapse.

  • Stage 0: No prolapse. Aa, Ba, Ap, Bp are all -3cm. C or D is between -TVL and -(TVL-2)cm.
  • Stage I: Most distal prolapse is >-1cm but ≤+1cm from hymen.
  • Stage II: Most distal prolapse is >+1cm but < (TVL-2)cm.

    ⭐ The most common site for prolapse is the anterior vaginal wall (cystocele).

  • Stage III: Most distal prolapse is ≥(TVL-2)cm but < TVL.
  • Stage IV: Complete eversion. Most distal prolapse is ≥(TVL-2)cm (often ≈TVL).

Staging Flowchart:

Other POP Classifications - Grading Games

FeatureBaden-Walker SystemPOP-Q System (Contrast)
DescriptionSimpler system. Grades 0 (normal) to 4 (procidentia) based on descent relative to hymen.Gold standard; objective 9-point measures.
B-W Stages0: Normal; 1: Halfway to hymen; 2: To hymen; 3: Halfway past hymen; 4: Complete prolapse.Uses Stages 0-IV (cm based).
ProsQuick, easy bedside assessment.Reproducible, research standard.
ConsSubjective, less reproducible.More complex, time-consuming.

High‑Yield Points - ⚡ Biggest Takeaways

  • POP-Q is the standardized system for POP classification.
  • Hymen is the zero reference point.
  • Anterior points: Aa (anterior wall at -3cm), Ba (most distal anterior).
  • Posterior points: Ap (posterior wall at -3cm), Bp (most distal posterior).
  • Apical points: C (cervix/vaginal cuff), D (posterior fornix).
  • Measurements: Genital hiatus (gh), perineal body (pb), total vaginal length (tvl).
  • Staging (0-IV) based on maximal prolapse extent relative to hymen.

Practice Questions: Pelvic Organ Prolapse: Classification

Test your understanding with these related questions

In young women suffering from 2nd & 3rd degree uterovaginal prolapse, the choice of operation is:

1 of 5

Flashcards: Pelvic Organ Prolapse: Classification

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Injury to the levator ani muscles results in _____ hypermobility and can result in prolapse of the anterior vaginal wall and the bladder

TAP TO REVEAL ANSWER

Injury to the levator ani muscles results in _____ hypermobility and can result in prolapse of the anterior vaginal wall and the bladder

urethral

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